SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4b9ea25272bbf71da626e525499de5a2ffa4094e6f80fac1677708d2c67d02d' 
  AND token = 'jzjhnxUPXo6S6omUH+PB8DMuXdSTJvoCalN/bjcZ0/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}